Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 30, Pages 11347-11351Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm11385b
Keywords
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Funding
- National Basic Research Program of China [2007CB613305]
- China-Japan cooperation project of science and technology [2009DFA61090]
- National Natural Science Foundation of China [21073090, 50732004, 10874077]
- Science and Technology Project of Jiangsu Province of China [BK2008028, BE2009140]
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Using a sol-gel hydrothermal method, we have synthesized Cr-doped SrTiO3 with a high specific surface area (19.3-65.4 m(2) g(-1), depending on the hydrothermal temperature). X-ray diffraction (XRD), UV-Vis diffuse reflectance spectra, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were used to investigate the Cr-doped SrTiO3. XRD analysis showed that Cr-doped SrTiO3 exhibited good crystallinity and the crystalline size calculated using Scherrer equation is about 20-30 nm. UV-Vis diffuse reflectance spectra showed that Cr doping can extend the absorption edge of SrTiO3 into visible region (540 nm). TEM images of Cr-doped SrTiO3 showed that the high temperature during the hydrothermal reaction will prompt the aggregation of primary particles into porous spheres. The porous structure was further certified by nitrogen physisorption results. By loading Pt (0.6 wt.%) nanoparticles as a cocatalyst, the as-prepared Cr-doped SrTiO3 photocatalyst exhibited high H-2 evolution rate (82.6 mu mol h(-1)) from 20% methanol solution under visible light irradiation, which is 3 times higher than that of the sample synthesized by solid state reaction. The high activity of the as-prepared Cr-doped SrTiO3 can be attributed to the high specific surface area and good crystallinity.
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